Fixed Invoke-Obfuscation command token error during agent negotiation process

lib/common/helpers.py

@@ -795,10 +795,8 @@ def obfuscate(psScript, obfuscationCommand):
     toObfuscateFile = open(toObfuscateFilename, 'w')
     toObfuscateFile.write(psScript)
     toObfuscateFile.close()
-    
     # Obfuscate using Invoke-Obfuscation w/ PowerShell
     subprocess.call("powershell 'Invoke-Obfuscation -ScriptPath %s -Command \"%s\" -Quiet | Out-File -Encoding ASCII %s'" % (toObfuscateFilename, convert_obfuscation_command(obfuscationCommand), obfuscatedFilename), shell=True)
-
     obfuscatedFile = open(obfuscatedFilename , 'r')
     # Obfuscation writes a newline character to the end of the file, ignoring that character
     psScript = obfuscatedFile.read()[0:-1]
@@ -820,13 +818,13 @@ def obfuscate_module(moduleSource, obfuscationCommand="", forceReobfuscation=Fal
     f.close()
 
     # obfuscate and write to obfuscated source path
+    obfuscatedCode = obfuscate(psScript=moduleCode, obfuscationCommand=obfuscationCommand)
     obfuscatedSource = moduleSource.replace("module_source", "obfuscated_module_source")
     try:
         f = open(obfuscatedSource, 'w')
     except:
         print color("[!] Could not read obfuscated module source path at: " + obfuscatedSource)
         return ""
-    obfuscatedCode = obfuscate(psScript=moduleCode, obfuscationCommand=obfuscationCommand)
     f.write(obfuscatedCode)
     f.close()
     

lib/listeners/http.py

@@ -404,7 +404,6 @@ class Listener:
             
             if obfuscate:
                 randomizedStager = helpers.obfuscate(randomizedStager, obfuscationCommand=obfuscationCommand)
-            print randomizedStager
             # base64 encode the stager and return it
             if encode:
                 return helpers.enc_powershell(randomizedStager)

lib/powershell/Invoke-Obfuscation/Out-ObfuscatedTokenCommand.ps1

@@ -128,7 +128,7 @@ http://www.danielbohannon.com
         # Run 'Comment' first since it will be the least number of tokens to iterate through, and comments may be introduced as obfuscation technique in future revisions.
         $ObfuscationTypeOrder += 'Comment'
         # Run 'String' second since otherwise we will have unnecessary command bloat since other obfuscation functions create additional strings.
-        # $ObfuscationTypeOrder += 'String'
+        $ObfuscationTypeOrder += 'String'
         $ObfuscationTypeOrder += (Get-Random -Input $ObfuscationChoices -Count $ObfuscationChoices.Count)
 
         # Apply each randomly-ordered $ObfuscationType from above step.
@@ -691,11 +691,35 @@ http://www.danielbohannon.com
                 default {Write-Error "An invalid `$ObfuscationLevel value ($ObfuscationLevel) was passed to switch block for String Token Obfuscation."; Exit}
             }
         }
-
         # Evenly trim leading/trailing parentheses.
         While($ObfuscatedToken.StartsWith('(') -AND $ObfuscatedToken.EndsWith(')'))
         {
-            $ObfuscatedToken = ($ObfuscatedToken.SubString(1,$ObfuscatedToken.Length-2)).Trim()
+            $TrimmedObfuscatedToken = ($ObfuscatedToken.SubString(1,$ObfuscatedToken.Length-2)).Trim()
+            # Check if the parentheses are balanced before permenantly trimming
+            $Balanced = $True
+            $Counter = 0
+            ForEach($char in $TrimmedObfuscatedToken.ToCharArray()) {
+                If($char -eq '(') {
+                    $Counter = $Counter + 1
+                }
+                ElseIf($char -eq ')') {
+                    If($Counter -eq 0) {
+                        $Balanced = $False
+                        break
+                    }
+                    Else {
+                        $Counter = $Counter - 1
+                    }
+                }
+            }
+            # If parantheses are balanced, we can safely trim the parentheses
+            If($Balanced -and $Counter -eq 0) {
+                $ObfuscatedToken = $TrimmedObfuscatedToken
+            }
+            # If parentheses cannot be trimmed, break out of loop
+            Else {
+                break
+            }
         }
     }
 
@@ -1157,6 +1181,9 @@ http://www.danielbohannon.com
     $SubSubString = $ScriptString.SubString($Token.Start+$Token.Length,$RemainingSubString)
     
     If(($Token.Content.ToLower() -eq 'invoke') `
+    -OR ($Token.Content.ToLower() -eq 'computehash') `
+    -OR ($Token.Content.ToLower() -eq 'tobase64string') `
+    -OR ($Token.Content.ToLower() -eq 'getstring') `
     -OR (((($Token.Start -gt 0) -AND ($ScriptString.SubString($Token.Start-1,1) -eq '.')) `
     -OR (($Token.Start -gt 1) -AND ($ScriptString.SubString($Token.Start-2,2) -eq '::'))) `
     -AND (($ScriptString.Length -ge $Token.Start+$Token.Length+1) -AND (($SubSubString.SubString(0,1) -ne '(') -OR (($SubSubString.Contains('[')) -AND !($SubSubString.SubString(0,$SubSubString.IndexOf('[')).Contains(')')))))))

setup/install.sh

@@ -42,17 +42,17 @@ elif lsb_release -d | grep -q "Kali"; then
 	pip install zlib_wrapper
 	pip install netifaces
         if ! which powershell > /dev/null; then
-            curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+            wget http://archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu55_55.1-7_amd64.deb
-            curl https://packages.microsoft.com/config/ubuntu/14.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
-            wget http://ftp.debian.org/debian/pool/main/i/icu/libicu52_52.1-8+deb8u5_amd64.deb
             wget http://ftp.debian.org/debian/pool/main/o/openssl/libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
-            dpkg -i libicu52_52.1-8+deb8u5_amd64.deb
+            wget https://github.com/PowerShell/PowerShell/releases/download/v6.0.0-alpha.16/powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
+            apt-get install -y libunwind8
+            dpkg -i libicu55_55.1-7_amd64.deb
             dpkg -i libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
-            apt-get install -y apt-transport-https
+            dpkg -i powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
-            apt-get update
+            apt-get install -f -y
-            apt-get install -y powershell
+            rm libicu55_55.1-7_amd64.deb
-            rm libicu52_52.1-8+deb8u5_amd64.deb
             rm libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
+            rm powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
         fi
         mkdir -p /usr/local/share/powershell/Modules
         cp -r ../lib/powershell/Invoke-Obfuscation /usr/local/share/powershell/Modules
@@ -72,11 +72,17 @@ elif lsb_release -d | grep -q "Ubuntu"; then
 	pip install zlib_wrapper
 	pip install netifaces
         if ! which powershell > /dev/null; then
-            curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+            wget http://archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu55_55.1-7_amd64.deb
-            curl https://packages.microsoft.com/config/ubuntu/14.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
+            wget http://ftp.debian.org/debian/pool/main/o/openssl/libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
-            apt-get install -y apt-transport-https
+            wget https://github.com/PowerShell/PowerShell/releases/download/v6.0.0-alpha.16/powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
-            apt-get update
+            apt-get install -y libunwind8
-            apt-get install -y powershell
+            dpkg -i libicu55_55.1-7_amd64.deb
+            dpkg -i libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
+            dpkg -i powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
+            apt-get install -f -y
+            rm libicu55_55.1-7_amd64.deb
+            rm libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
+            rm powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
         fi
         mkdir -p /usr/local/share/powershell/Modules
         cp -r ../lib/powershell/Invoke-Obfuscation /usr/local/share/powershell/Modules
@@ -96,11 +102,17 @@ else
 	 pip install zlib_wrapper
 	 pip install netifaces
          if ! which powershell > /dev/null; then
-            curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+            wget http://archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu55_55.1-7_amd64.deb
-            curl https://packages.microsoft.com/config/ubuntu/14.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
+            wget http://ftp.debian.org/debian/pool/main/o/openssl/libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
-            apt-get install -y apt-transport-https
+            wget https://github.com/PowerShell/PowerShell/releases/download/v6.0.0-alpha.16/powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
-            apt-get update
+            apt-get install -y libunwind8
-            apt-get install -y powershell
+            dpkg -i libicu55_55.1-7_amd64.deb
+            dpkg -i libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
+            dpkg -i powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
+            apt-get install -f -y
+            rm libicu55_55.1-7_amd64.deb
+            rm libssl1.0.0_1.0.1t-1+deb8u6_amd64.deb
+            rm powershell_6.0.0-alpha.16-1ubuntu1.16.04.1_amd64.deb
          fi
          mkdir -p /usr/local/share/powershell/Modules
          cp -r ../lib/powershell/Invoke-Obfuscation /usr/local/share/powershell/Modules